feat: Add Collection.pipe method analogous to polars Lazy-/DataFrames

[Moritz Potthoff (MoritzPotthoffQC)]

Motivation

I recently wanted to use this and realized I can't. I think it would be nice to support this so that we can use the same operation chaining pattern we use for data frames also for collections.

Changes

• Add Collection.pipe method with the same interface as pl.LazyFrame.pipe (see here)
• Add simple tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (3089ece) to head (43b0063).

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files           56        56           
  Lines         3471      3475    +4     
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+ Hits          3471      3475    +4     

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[Copilot]

Pull request overview

Adds a Collection.pipe helper to enable fluent, Polars-style operation chaining on dy.Collection instances, mirroring the ergonomics of pl.LazyFrame.pipe while preserving type information via ParamSpec/Concatenate.

Changes:

• Introduces Collection.pipe(function, *args, **kwargs) that calls function(self, *args, **kwargs) and returns the function’s result.
• Adds unit tests covering self forwarding, args/kwargs forwarding, and arbitrary return types.
• Exposes the new API in the collection operations docs autosummary.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
dataframely/collection/collection.py	Adds the new Collection.pipe method with typed signature and docstring.
tests/collection/test_pipe.py	Adds tests validating behavior and return-type flexibility of Collection.pipe.
docs/api/collection/operations.rst	Includes Collection.pipe in the documented collection operations list.

[Oliver Borchert (borchero)]

Nice :)